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All that needs to be done in xml_end() is to reset the two state variables, and all that the xml_char() subroutine needs to do is to call the add_text() method if both the state variables are true. This concludes the program that parses the XML file. It is now time to have a look at the Picture module. It contains code for three classes, Picture::Index, Picture::List, and Picture. The names of these three packages makes it clear that they reflect the data structure in the XML document.
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The Picture::Index class
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The Picture::Index class is responsible for the creation of the index pages, and the management of photo lists. It also contains convenient methods that forward information to the lists that are managed. Let s have a look at how Picture::Index is implemented:
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package Picture::Index; use strict; use CGI qw(-no_debug); our %options = ( out_dir => '.', ); sub new { my $proto = my %attrs = my $class = my $self = bless $self }
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Default options
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shift; @_; ref($proto) || $proto; {%options, %attrs, _lists => []}; => $class;
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The Picture::Index class includes the CGI module, for generating HTML. That way we don t have to worry as much about correctly opening and closing tags, and can let a thoroughly debugged module do all the hard work for us. A package-wide %options hash is declared, which is used to initialize objects that are instantiated from this class. This can be seen in the new() method, which is defined next. The objects of the class are all instantiated with the contents of the %options hash, overridden with the arguments (stored in %attrs) and have a reference to an empty array added to the store picture lists. This array will be used to store the contained photo lists, which are implemented as Picture::List objects, discussed later. The set_option() method can be used to set individual attributes for the class as a whole, or for individual objects.
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sub set_option { my $proto = shift; my %attrs = @_; Picture->set_option(@_);
if (ref($proto)) { $proto->{$_} = $attrs{$_} for keys %attrs; } else { %options = (%options, %attrs); } }
O the Picture class O Is this an object
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In any case, the call is forwarded to the Picture class, so that all attributes set in this subroutine become class defaults. If the method is called on an object reference, the object s options are changed, otherwise the class options are changed. The add_list() method is used to create a new list in the index. This is accomplished by instantiating a new Picture::List object (discussed later), and pushing that onto the end of the array that contains all lists. At this time a file name is also assigned to this particular list, which will be used for the output phase.
sub add_list { my $self = shift; my %attrs = @_; my $list = Picture::List->new(%attrs); my $num = push(@{$self->{_lists}}, $list); $self->last_list->{filename} = "index$num.html"; } sub last_list { my $self = shift; $self->{_lists}->[-1]; }
The last_list() method can be used to get a reference to the last list added. The add_picture() and add_text() methods just add a picture to the current list, or text to the current picture.
sub add_picture { my $self = shift; $self->last_list->add_picture(@_); } sub add_text { my $self = shift; $self->last_list->last_picture->add_text(@_); }
This is done by forwarding the call to the current Picture::List or Picture object, which can be obtained through the method last_list() in Picture::List and the last_picture() method in Picture, which will be discussed later. There should be no surprises in this way of delegating work for anyone who is familiar with OO programming. The only code left to write for this package is the code that actually generates the output files from the information provided:
sub generate_output { my $self = shift; local(*OUT);
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